Assessment of the Manoeuvrability Characteristics of a Twin Shaft Naval Vessel Using an Open-Source CFD Code

Franceschi, Andrea; Piaggio, Benedetto; Tonelli, Roberto; Villa, Diego; Viviani, Michele

doi:10.3390/jmse9060665

Cited by 17 publications

(12 citation statements)

References 31 publications

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“…2. Grid setup commonly used for static yaw rate computations (reproduced from Franceschi et al [11]).…”

Section: Common Approach For the Simulation Of Rotational Motion Usin...mentioning

confidence: 99%

“…In literature, several approaches for the grid design can be found, such as designing the grid specifically for the given manoeuvring condition as done by Zhang et al [14,40], Franceschi et al [11] or Park et al [26]. An example is included in Fig.…”

Section: Common Approach For the Simulation Of Rotational Motion Usin...mentioning

confidence: 99%

“…An example is included in Fig. 2, reproduced from [11]. Such an approach means that every computation needs a separate and dedicated grid.…”

Section: Common Approach For the Simulation Of Rotational Motion Usin...mentioning

confidence: 99%

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A technique for efficient computation of steady yaw manoeuvres using CFD

Oud

Toxopeus

2022

ISP

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Hydrodynamic loads acting on a ship can nowadays be reliably obtained from Computational Fluid Dynamics (CFD) techniques. In particular for the determination of the hydrodynamic coefficients of a mathematical manoeuvring model, the forces and moments on a ship sailing at a drift angle or with a yaw rate can be computed efficiently with CFD. While computations with a drift angle are relatively straightforward, computations involving a yaw rate present a challenge. This challenge consists in how to deal with the grid, the setup and the ship encountering its own wake when rotating. A solution based on a single grid setup with consistent boundary conditions and utilising a body force wake damping zone to remedy this challenge is proposed in this paper, leading to an effective, fast, and accurate method to compute hydrodynamic loads of a ship in steady yaw manoeuvres.

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“…2. Grid setup commonly used for static yaw rate computations (reproduced from Franceschi et al [11]).…”

Section: Common Approach For the Simulation Of Rotational Motion Usin...mentioning

confidence: 99%

Section: Common Approach For the Simulation Of Rotational Motion Usin...mentioning

confidence: 99%

See 1 more Smart Citation

A technique for efficient computation of steady yaw manoeuvres using CFD

Oud

Toxopeus

2022

ISP

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“…To this aim the computational grid is realized by a combination of two subdomains, a far-field and an inner region surrounding the hull, where different tools and meshing strategies are adopted. This mesh arrangement has been already successfully adopted in [40,41]. A sketch is reported in Figure 8.…”

Section: Flow Solvermentioning

confidence: 99%

An Effective Mesh Deformation Approach for Hull Shape Design by Optimization

Villa

Furcas

Pralits

et al. 2021

JMSE

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A method for the morphing of surface/volume meshes suitable to be used in hydrodynamic shape optimization is proposed. Built in the OpenFOAM environment, it relies on a Laplace equation that propagates the modifications of the surface boundaries, realized by applying a free-form deformation to a subdivision surface description of the geometry, into the computational volume mesh initially built through a combination of BlockMesh with cfMesh. The feasibility and robustness of this mesh morphing technique, used as a computationally efficient pre-processing tool, is demonstrated in the case of the resistance minimization of the DTC hull. All the hull variations generated within a relatively large design space are efficiently and successfully realized, i.e., without mesh inconsistencies and quality issues, only by deforming the initial mesh of the reference geometry. Coupled with a surrogate model approach, a significant reduction in the calm water resistance, in the extent of 10%, has been achieved in a reasonable computational time.

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“…The roll moment of a ship has been a prime concern due to being the most dangerous among the 6-DoF, which has the possible consequences of instability and ship capsize. In general, the roll moment has usually been ignored when analyzing the maneuverability of the ship with low GM and high-speed ships, such as the KCS, DTMB, and ONRT, according to Hajivand et al [1], Liu et al [2], Franceschi et al [3], and Li et al [4]. However, it is widely known that the effect of the roll moment becomes significant for surface ships with small GM and high speed.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Roll Derivatives of Different Surface Ships Based on Numerical Pure Roll Simulation

Mai

Vo²,

Yoon³

et al. 2022

JMSE

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Among the 6 degrees of freedom (6-DoF), excessive roll motion is the most dangerous cause of ships capsizing. However, when analyzing the maneuverability of surface ships, the roll components have usually been ignored. It is widely known that the influence of roll moment becomes significant for surface ships with low GM (metacentric height) and high speed. This paper examines the pure roll test for several surface ships to assess the roll-related hydrodynamic derivatives of added mass and damping in maneuvering. The objective ships are the KRISO Container Ship (KCS), David Taylor Model Basin (DTMB), Office of Naval Research Tumblehome (ONRT), and Delft 372 catamaran, where the DTMB and ONRT ships are equipped with complementary bilge keels as damping devices and have a small GM, which the Delft 372 catamaran does not have. The flow during pure roll is analyzed by the Computational Fluid Dynamics (CFD) simulation method that allows the complex flow around ships to be captured, especially when the bilge keel and skeg are considered. The results indicate that the roll moment is greatest in the catamaran. Since the roll moments of the DTMB and ONRT are larger than that of the KCS, bilge keels and surface shape also contribute to increasing roll damping moment. In addition, a comparison of the damping derivatives due to roll rate with results obtained from another method indicates that CFD simulation is capable of accurately predicting the roll-related derivatives, which is difficult to perform by the experiment method.

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Assessment of the Manoeuvrability Characteristics of a Twin Shaft Naval Vessel Using an Open-Source CFD Code

Cited by 17 publications

References 31 publications

A technique for efficient computation of steady yaw manoeuvres using CFD

A technique for efficient computation of steady yaw manoeuvres using CFD

An Effective Mesh Deformation Approach for Hull Shape Design by Optimization

Assessment of the Roll Derivatives of Different Surface Ships Based on Numerical Pure Roll Simulation

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